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What you are experiencing isn't "sleep" mode, it is the screen saver. If you have WINXP, right click on a clear area of the desktop, and select "Properties". When the DISPLAY PROPERTIES window appears, select the "screen saver" tab. Change the "WAIT" time to the time you wish the scrren saver to delay. If you don't want to have to login after a screen time out, uncheck the "On resume, display Welcome Screen" box.

You can prevent the computer from going into sleep or hibernation mode by going to the CONTROL PANEL - POWER SETTINGS.

Once here, change the settings to High Performance.

You can also go into advanced properties and manually change all of the settings - including when the hard drives go to sleep (I set this to NEVER), when the monitor will go to sleep (again, I set to never).

Hi there, it appears as though the Power Options are set too short a time and the PC is going into sleep mode.
Go to Start menu/Control Panel and look for Power options. Set them all to "never" This will prevent her PC from going into sleep mode.
Good Luck.

Try a different monitor, I am sure this sounds overly simplistic to you but, I have seen in my customers have just that, a bad monitor.If another monitor does the same thing, then you should try another video card.If the video in on the motherboard, there should be a AGP, PCI-e, or an empty PCI slot to put a video card in.